An official website of the United States government
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
 Image Number D3145-1 |
A covered gas flux chamber from a study done in a field of maize during two growing seasons. The study examined the effects of different nitrogen fertilizer sources and application methods on nitrous oxide emissions.
Photo by Rodney Venterea.
